So I think I figured it out. Your first app is using the transaction receipt: SKPaymentTransaction.TransactionReceipt. The second app is using the AppStoreReceiptUrl: NSBundle.MainBundle.AppStoreReceiptUrl. This second one is the correct one to use I think according to the documentation

@MFerrisHT did you ever get to the bottom of this? I'm seeing now that we're getting a different structure too, but on the same app. Originally we were getting the second version (array of pending_renewal_info) - which corresponds to the documentation. Now I'm getting the same response as your first app. Can't find any info on this

Thanks for the idea Alexdoo. From a UX perspective this doesn't seem like an optimal solution... The user now has to jump through a few hoops just to delete their account. Hopefully Apple provide a nicer solution for users. In the mean time, I think this is a fringe issue... most users that delete their account don't want to sign in again.